Review on Yimaa 2 Pack Bike Mirrors - Universal Bicycle Handlebar Rearview Mirrors, 360° Adjustable and Rotatable Cycling Mirror Accessories for Mountain and Road Bike Cycling by Mike Weaver

Mirror optics are pretty good - actually better than the much more expensive small 'big brand' mirror I've bought before. They offer a reasonable field of view without adding too much distortion. The mirrors also feel like real glass, so I'm optimistic they won't scratch as badly as other mirrors I've dealt with. The mirror mount is also of decent quality - it vibrates a bit on bad roads - but not that much. A lot has to do with usability. I wasn't expecting to use the included bell (I wasn't too hopeful given the low price) but it also works great and I use it on one of my bikes.